AN EFFICIENT SYNTHESIS OF TRICYCLIC COMPOUNDS, (+/-)-(4abeta8abeta10aalpha)-1,2,3,4,4a,6,7,8,8a,9,10,10a-DODECAHYDRO-1,1,4a-TRIMETHYL-2-OXOPHENANTHRENE-8a-CARBOXYLIC ACID, ITS METHYL ESTER, AND (+/-)-(4abeta,8abeta10aalpha)-3,4,4a,6,7,8,8a,9,10,10a-DECAHYDRO-8a-HYDROXYMETHYL-1,1,4a-TRIMETHYLPHENANTHREN-2(1H)-ONE